Do not let anything disturb your peace.
First of all, it is your peace, you should not let anything or anyone take it from you without your permission.
Why does your peace get disturbed in the first place?
When one has gone through the oftentimes arduous and life-threatening journey of spiritual awakening, they will often get that sudden "eureka" moment of pure bliss and satisfaction.
To their dismay, it doesn't last.
In their disheartened state, they will question whether what they achieved was enlightenment at all, or the dreaded makyo, of the Zen Buddhist tradition where the visions of angles and supreme bliss they encounter are just figments of the imagination.
"Bliss" and "satisfaction" are just states; temporary moments of feeling slightly more evolved than one's normal feelings of "happiness", "sadness", or "anger".
Because they are more evolved, they will tend to stay longer, but even so, there will come a time in which they will be present no longer.
The question is then...
...what remains when the moments are gone?
Is there something that can always stay with you? The answer is actually yes, and that thing is contentment.
Having the ultimate knowledge of reality results in peace when you are able to see the basis behind everything around you.
This is somewhat beyond knowledge, however knowledge is there; it is feeling, intuition.
The intuition can be cultivated; this is the spiritual path.
I hope that you reach your destination soon.